.li-col {
  $col-span: "-span-";
  $col-offset: "-offset-";
  @for $n from 1 through 24 {
    &#{$col-span}#{$n} {
      width: ($n / 24) * 100%;
    }
  }
  @for $n from 1 through 24 {
    &#{$col-offset}#{$n} {
      margin-left: ($n / 24) * 100%;
    }
  }
}
